xcode 无法将“NSAttributedString.DocumentAttributeKey”类型的值转换为预期的字典键类型“NSAttributedString.DocumentReadingOptionKey”
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Cannot convert value of type 'NSAttributedString.DocumentAttributeKey' to expected dictionary key type 'NSAttributedString.DocumentReadingOptionKey'
提问by
I have just updated to Xcode 9 and converted my app from swift 3 to swift 4 and get this errors. how i can fix this?
我刚刚更新到 Xcode 9 并将我的应用程序从 swift 3 转换为 swift 4 并出现此错误。我该如何解决这个问题？
func displayText() {
do {
if url.pathExtension.lowercased() != "rtf" {
let fileContent = try String(contentsOf: url)
text.text = fileContent
} else { // Is RTF file
let attributedString = try NSAttributedString(url: url, options: [NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType], documentAttributes: nil)
text.attributedText = attributedString
text.isEditable = false
}
}
And get this Error
并得到这个错误
Cannot convert value of type 'NSAttributedString.DocumentAttributeKey' to expected dictionary key type 'NSAttributedString.DocumentReadingOptionKey'
无法将“NSAttributedString.DocumentAttributeKey”类型的值转换为预期的字典键类型“NSAttributedString.DocumentReadingOptionKey”
回答by Krunal
In swift 4 - NSAttributedString representation is completely changed.
在 swift 4 - NSAttributedString 表示完全改变。
Replace your attribute dictionary key and value [NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType]with [NSAttributedString.DocumentReadingOptionKey.documentType : NSAttributedString.DocumentType.rtf]
将您的属性字典键和值[NSDocumentTypeDocumentAttribute:NSRTFTextDocumentType]替换为[NSAttributedString.DocumentReadingOptionKey.documentType : NSAttributedString.DocumentType.rtf]
Try this:
尝试这个：
func displayText() {
do {
if url.pathExtension.lowercased() != "rtf" {
let fileContent = try String(contentsOf: url)
text.text = fileContent
} else { // Is RTF file
let attributedString = try NSAttributedString(url: url, options: [NSAttributedString.DocumentReadingOptionKey.documentType : NSAttributedString.DocumentType.rtf], documentAttributes: nil)
text.attributedText = attributedString
text.isEditable = false
}
}
}
Here is note from Apple: NSAttributedString - Creating an NSAttributedString Object
这是 Apple 的注释：NSAttributedString - 创建一个 NSAttributedString 对象
